This Macro Coupler Ring allows you to mount lens reversely on another lens so that the lens work as Macro lens and give high magnification ratio with small focussing distance. This method of achieving the magnification is the highest ratio giving method in Macro Photography. The ring has male thread on both size. Simply screw it on the lens of your camera with thread size 52mm and you are ready to screw 52mm thread size lens reversely on it. It is suggested to attach lens with longer focal length with Camera and then mount lens with shorter focal length on it using this Macro coupler ring